Nia Roberts Margaret Actor Russell Gomer Dai Chi Actor Rhodri Meilir Clive Actor Rhodri Evan Haydn Owen Actor Suzanne Packer Sgt Ruth Ellis Actor William Thomas John Frederick Watkins Actor Rhys Parry Jones Frank Actor Richard Lynch Herbie Watkins Actor Toni Caroll Cassie Actor Jack Quick PC Eifion Richards Actor Richard Harrington Glyn Actor Hannah Daniel Sylvia Actor Steffan Cennydd Lefi Actor Jacob Ifan Alex Rapado Actor Ed Thomas Director, Executive Producer Adam Partridge Producer Ffion Williams Producer, Executive Producer